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Patent US2550490A successfully refreshed from Google Patents.
US2550490A
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Complex alkali metal-aluminum and alkali metal-iron acid phosphates
Assignee: Victor Chemical Works
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Filing: 1945-10-29
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Granted: 1951-04-24
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Expires: 1965-10-29
Abstract
No abstract record available.
Inventors
- 👤 Guy A Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:37
CPC Classifications
A; A21; A21D; A21D2/00; A21D2/02; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A CRYSTALLINE COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
6 words
A CRYSTALLINE COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
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GB191405111A
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US1234858A
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US1834747A
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US1944881A
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US1926266A
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US2160701A
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US2314090A
Cited
US2291608A
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US2291609A
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US2408258A
Cited
US2405884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |